Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82d1aa8d49584ac…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 14:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 92680093ec6a0b1702330b44ade90e08 SHA-1: 07f86032e07b94b74b5cc0c0d03b3aaf9702b9df SHA-256: e82d1aa8d49584accca637bd7cf149b7b90b1e3c0da5d255b788c7651f6d16ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Several heuristics indicate the presence of malicious links and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=lyric+video+maker+apk PDF link annotation
    • http://herningbadintra.dk/app/webroot/upload/files/25657202478.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/kesifarekonanusima.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/b8thhn7mm2d2nlc23gd9veo296/11081823719.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/90958303159.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/7229856021.pdfIn PDF document text
    • http://hmed.vn/upload/files/40839535852.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/bixuwufizegelekijuziwozuk.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/75968539172.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/87679826236.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9c814c970a3929fcf39c80bc6be5db10/nitin.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/xitub.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/momoli.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/notedades.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109130056393786.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614392708633c---xatodurozuvovibejamixov.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/92081657549.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/66692768343.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/nusafetubaramepene.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/bethgemk8ehndh0qaoaor19936/fujux.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/80219217804.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/95365640927.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/rababazabadawuzapumiriku.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/kalixije.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-19-14-52-30-41.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 17044 bytes
SHA-256: e06e1291011db446b84ca6ce21b95842209cf81ba836a1ea3cbd0a1aa6c30528
font_01_sfnt_off000111a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B9 10488 bytes
SHA-256: 518a5b0695026393947fdbeebeb04cdf402e49b8c7d86fbf1058077dedadc634

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